All of these spectrograms have been created using bat calls recorded from a Raspberry Pi bat recorder.  Click on an image to display full screen.  If I have incorrectly identified a bat species, let me know 🙂

Soprano Pipistrelle Bat

Serotine Bat

Noctule Bat

Natterer’s Bat

Myotis Species

Various Social Calls

Rat Distress Call

Note the faint bat (Common Pipistrelle?) call, too.